/* Copyright (c) 2012 Nordic Semiconductor. All Rights Reserved.
 *
 * The information contained herein is confidential property of Nordic
 * Semiconductor ASA.Terms and conditions of usage are described in detail
 * in NORDIC SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
 *
 * Licensees are granted free, non-transferable use of the information. NO
 * WARRANTY of ANY KIND is provided. This heading must NOT be removed from
 * the file.
 *
 * $$
 */

/** @file
 *
 * @defgroup ble_sdk_app_hids_mouse_main main.c
 * @{
 * @ingroup ble_sdk_app_hids_mouse
 * @brief HID Mouse Sample Application main file.
 *
 * This file contains is the source code for a sample application using the HID, Battery and Device
 * Information Service for implementing a simple mouse functionality. This application uses the
 * @ref app_scheduler.
 *
 * Also it would accept pairing requests from any peer device. This implementation of the
 * application will not know whether a connected master is a known device or not.
 */

#include <stdint.h>
#include <string.h>
#include "nordic_common.h"
#include "nrf.h"
#include "nrf_assert.h"
#include "nrf_error.h"
#include "nrf_gpio.h"
#include "nrf51_bitfields.h"
#include "ble.h"
#include "ble_srv_common.h"
#include "ble_advdata.h"
#include "ble_hids.h"
#include "ble_bas.h"
#include "ble_dis.h"
#include "ble_conn_params.h"
#include "ble_nrf6310_pins.h"
#include "ble_sensorsim.h"
#include "app_scheduler.h"
#include "ble_stack_handler.h"
#include "app_timer.h"


#define LEFT_BUTTON_PIN_NO              NRF6310_BUTTON_0        /**< Button used for moving the mouse pointer to the left. */
#define RIGHT_BUTTON_PIN_NO             NRF6310_BUTTON_1        /**< Button used for moving the mouse pointer to the right. */
#define UP_BUTTON_PIN_NO                NRF6310_BUTTON_2        /**< Button used for moving the mouse pointer upwards. */
#define DOWN_BUTTON_PIN_NO              NRF6310_BUTTON_3        /**< Button used for moving the mouse pointer downwards. */

#define DEVICE_NAME                     "NORDIC_MOUSE_0.1"      /**< Name of device. Will be included in the advertising data. */
#define MANUFACTURER_NAME               "NordicSemiconductor"   /**< Manufacturer. Will be passed to Device Information Service. */

#define BATTERY_LEVEL_MEAS_INTERVAL     2000                    /**< Battery level measurement interval (milliseconds). */
#define MIN_BATTERY_LEVEL               81                      /**< Minimum simulated battery level. */
#define MAX_BATTERY_LEVEL               100                     /**< Maximum simulated battery level. */
#define BATTERY_LEVEL_INCREMENT         1                       /**< Increment between each simulated battery level measurement. */

#define PNP_ID_VENDOR_ID_SOURCE         0x02                    /**< Vendor ID Source. */
#define PNP_ID_VENDOR_ID                0x1915                  /**< Vendor ID. */
#define PNP_ID_PRODUCT_ID               0xEEEE                  /**< Product ID. */
#define PNP_ID_PRODUCT_VERSION          0x0001                  /**< Product Version. */

#define APP_ADV_INTERVAL                64                      /**< The advertising interval (in units of 0.625 ms. This value corresponds to 40 ms). */
#define APP_ADV_TIMEOUT_IN_SECONDS      180                     /**< The advertising timeout (in units of seconds). */

#define MIN_CONN_INTERVAL               6                       /**< Minimum connection interval (7.5 ms). */
#define MAX_CONN_INTERVAL               12                      /**< Maximum connection interval (15 ms). */
#define SLAVE_LATENCY                   20                      /**< Slave latency. */
#define CONN_SUP_TIMEOUT                (3 * 100)               /**< Connection supervisory timeout (3 seconds). */
#define FIRST_CONN_PARAM_UPDATE_DELAY   (5 * 1000)              /**< Time from initiating event (connect or start of notification) to first time ble_gap_conn_param_update is called (5 seconds). */
#define NEXT_CONN_PARAM_UPDATE_DELAY    (30 * 1000)             /**< Time between each call to ble_gap_conn_param_update after the first (30 seconds). */
#define MAX_CONN_PARAM_UPDATE_COUNT     3                       /**< Number of attempts before giving up the connection parameter negotiation. */

#define SEC_PARAM_TIMEOUT               60                      /**< Timeout for Pairing Request or Security Request (in seconds). */
#define SEC_PARAM_BOND                  1                       /**< Perform bonding. */
#define SEC_PARAM_MITM                  0                       /**< Man In The Middle protection not required. */
#define SEC_PARAM_IO_CAPABILITIES       BLE_GAP_IO_CAPS_NONE    /**< No I/O capabilities. */
#define SEC_PARAM_OOB                   0                       /**< Out Of Band data not available. */
#define SEC_PARAM_MIN_KEY_SIZE          7                       /**< Minimum encryption key size. */
#define SEC_PARAM_MAX_KEY_SIZE          16                      /**< Maximum encryption key size. */

#define MOVEMENT_SPEED                  5                       /**< Number of pixels by which the cursor is moved each time a button is pushed. */
#define INPUT_REPORT_COUNT              3                       /**< Number of input reports in this application. */
#define INPUT_REP_BUTTONS_LEN           3                       /**< Length of Mouse Input Report containing button data. */
#define INPUT_REP_MOVEMENT_LEN          3                       /**< Length of Mouse Input Report containing movement data. */
#define INPUT_REP_MEDIA_PLAYER_LEN      1                       /**< Length of Mouse Input Report containing media player data. */
#define INPUT_REP_BUTTONS_INDEX         0                       /**< Index of Mouse Input Report containing button data. */
#define INPUT_REP_MOVEMENT_INDEX        1                       /**< Index of Mouse Input Report containing movement data. */
#define INPUT_REP_MPLAYER_INDEX         2                       /**< Index of Mouse Input Report containing media player data. */
#define INPUT_REP_REF_BUTTONS_ID        1                       /**< Id of reference to Mouse Input Report containing button data. */
#define INPUT_REP_REF_MOVEMENT_ID       2                       /**< Id of reference to Mouse Input Report containing movement data. */
#define INPUT_REP_REF_MPLAYER_ID        3                       /**< Id of reference to Mouse Input Report containing media player data. */

#define BASE_USB_HID_SPEC_VERSION       0x0101                  /**< Version number of base USB HID Specification implemented by this application. */

static ble_hids_t                       s_hids;                 /**< Structure used to identify the HID service. */
static ble_bas_t                        s_bas;                  /**< Structure used to identify the battery service. */
static ble_gap_sec_params_t             s_sec_params;           /**< Security requirements for this application. */
static bool                             s_in_boot_mode = false; /**< Current protocol mode. */

static ble_sensorsim_cfg_t              s_battery_sim_cfg;      /**< Battery Level sensor simulator configuration. */
static ble_sensorsim_state_t            s_battery_sim_state;    /**< Battery Level sensor simulator state. */


static void on_hids_evt(ble_hids_t * p_hids, ble_hids_evt_t * p_evt);


/**@brief Assert macro callback function.
 *
 * @details This function will be called if the ASSERT macro fails.
 *
 * @param[in]   line_num   Line number of the failing ASSERT call.
 * @param[in]   file_name  File name of the failing ASSERT call.
 */
void assert_nrf_callback(uint16_t line_num, const uint8_t * file_name)
{
    // Copying parameters to static variables because parameters are not accessible in debugger
    static volatile uint8_t  s_file_name[128];
    static volatile uint16_t s_line_num;

    strcpy((char *)s_file_name, (const char *)file_name);
    s_line_num = line_num;
    UNUSED_VARIABLE(s_file_name);
    UNUSED_VARIABLE(s_line_num);
    
    nrf_gpio_pin_set(ASSERT_LED_PIN_NO);

    for (;;)
    {
        // Loop forever. On assert, the system can only recover on reset
    }
}


/**@brief Service error handler.
 *
 * @details A pointer to this function will be passed to each service which may need to inform the 
 *          application about an error.
 *
 * @param[in]   nrf_error   Error code containing information about what went wrong.
 */
static void service_error_handler(uint32_t nrf_error)
{
    ASSERT(false);
}


/**@brief Perform battery measurement, and update Battery Level characteristic in Battery Service.
 */
static void battery_level_update(void)
{
    uint32_t err_code;
    uint8_t  battery_level;
    
    battery_level = (uint8_t)ble_sensorsim_measure(&s_battery_sim_state, &s_battery_sim_cfg);
    
    err_code = ble_bas_battery_level_update(&s_bas, battery_level);
    if (
        (err_code != NRF_SUCCESS) 
        && 
        (err_code != NRF_ERROR_INVALID_STATE) 
        && 
        (err_code != BLE_ERROR_NO_TX_BUFFERS)
        &&
        (err_code != BLE_ERROR_GATTS_SYS_ATTR_MISSING)
    )
    {
        ASSERT(false);
    }
}


/**@brief Battery measurement timer timeout handler.
 *
 * @details This function will be called each time the battery level measurement timer expires.
 *
 * @param[in]   timer_id   Id of timer that has expired.
 */
static void battery_level_meas_timeout_handler(app_timer_id_t timer_id)
{
    ASSERT(timer_id == APP_TIMER_BATTERY_LEVEL_MEAS);
    battery_level_update();
}


/**@brief LEDs initialization.
 *
 * @details Initializes all LEDs used by the application.
 */
static void leds_init(void)
{
    GPIO_LED_CONFIG(ADVERTISING_LED_PIN_NO);
    GPIO_LED_CONFIG(CONNECTED_LED_PIN_NO);
    GPIO_LED_CONFIG(ASSERT_LED_PIN_NO);
}


/**@brief Timer initialization.
 *
 * @details Initializes the timer module.
 */
static void timers_init(void)
{
    uint32_t err_code;
    
    // Initialize timer module, making it use the scheduler
    err_code = app_timer_init(app_sched_timer_event_schedule);
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }
}


/**@brief GAP initialization.
 *
 * @details This function shall be used to setup all the necessary GAP (Generic Access Profile) 
 *          parameters of the device. It also sets the permissions and appearance.
 */
static void gap_params_init(void)
{
    uint32_t                err_code;
    ble_gap_conn_params_t   gap_conn_params;
    ble_gap_conn_sec_mode_t sec_mode;

    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&sec_mode);
    
    err_code = ble_gap_device_name_set(&sec_mode, DEVICE_NAME);
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }

    err_code = ble_gap_appearance_set(BLE_APPEARANCE_MOUSE_HID_SUBTYPE);
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }
    
    memset(&gap_conn_params, 0, sizeof(gap_conn_params));

    gap_conn_params.min_conn_interval = MIN_CONN_INTERVAL;
    gap_conn_params.max_conn_interval = MAX_CONN_INTERVAL;
    gap_conn_params.slave_latency     = SLAVE_LATENCY;
    gap_conn_params.conn_sup_timeout  = CONN_SUP_TIMEOUT;

    err_code = ble_gap_ppcp_set(&gap_conn_params);
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }
}


/**@brief Advertising functionality initialization.
 *
 * @details Encodes the required advertising data and passes it to the stack.
 *          Also builds a structure to be passed to the stack when starting advertising.
 */
static void advertising_init(void)
{
    uint32_t      err_code;
    ble_advdata_t advdata;
    uint8_t       flags = BLE_GAP_DISC_MODE_LIMITED | BLE_GAP_DISC_BR_EDR_NOT_SUPPORTED;
    
    ble_uuid_t adv_uuids[] = {{BLE_UUID_HUMAN_INTERFACE_DEVICE_SERVICE, BLE_UUID_TYPE_BLE}};

    // Build and set advertising data
    memset(&advdata, 0, sizeof(advdata));
    
    advdata.name_type               = BLE_ADVDATA_FULL_NAME;
    advdata.include_appearance      = true;
    advdata.flags.size              = sizeof(flags);
    advdata.flags.p_data            = &flags;
    advdata.uuids_complete.uuid_cnt = sizeof(adv_uuids) / sizeof(adv_uuids[0]);
    advdata.uuids_complete.p_uuids  = adv_uuids;
    
    err_code = ble_advdata_set(&advdata, NULL);
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }
}


/**@brief Initialize Device Information Service.
 */
static void dis_init(void)
{
    uint32_t         err_code;
    ble_dis_init_t   dis_init_obj;
    ble_dis_pnp_id_t pnp_id;
    
    pnp_id.vendor_id_source = PNP_ID_VENDOR_ID_SOURCE;
    pnp_id.vendor_id        = PNP_ID_VENDOR_ID;
    pnp_id.product_id       = PNP_ID_PRODUCT_ID;
    pnp_id.product_version  = PNP_ID_PRODUCT_VERSION;

    memset(&dis_init_obj, 0, sizeof(dis_init_obj));
    
    ble_srv_ascii_to_utf8(&dis_init_obj.manufact_name_str, MANUFACTURER_NAME);
    dis_init_obj.p_pnp_id = &pnp_id;

    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&dis_init_obj.dis_attr_md.read_perm);
    BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&dis_init_obj.dis_attr_md.write_perm);

    err_code = ble_dis_init(&dis_init_obj);
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }
}


/**@brief Initialize Battery Service.
 */
static void bas_init(void)
{
    uint32_t       err_code;
    ble_bas_init_t bas_init_obj;
    
    memset(&bas_init_obj, 0, sizeof(bas_init_obj));
    
    bas_init_obj.evt_handler          = NULL;
    bas_init_obj.support_notification = true;
    bas_init_obj.p_report_ref         = NULL;
    bas_init_obj.initial_batt_level   = 100;
    
    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&bas_init_obj.battery_level_char_attr_md.cccd_write_perm);
    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&bas_init_obj.battery_level_char_attr_md.read_perm);
    BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&bas_init_obj.battery_level_char_attr_md.write_perm);

    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&bas_init_obj.battery_level_report_read_perm);
    
    err_code = ble_bas_init(&s_bas, &bas_init_obj);
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }
}


/**@brief Initialize HID Service.
 */
static void hids_init(void)
{
    uint32_t                  err_code;
    ble_hids_init_t           hids_init_obj;
    ble_hids_inp_rep_init_t   inp_rep_array[INPUT_REPORT_COUNT];
    ble_hids_inp_rep_init_t * p_input_report;
    uint8_t                   hid_info_flags;
    
    static uint8_t rep_map_data[] =
    {
        0x05, 0x01,                     // Usage Page (Generic Desktop)
        0x09, 0x02,                     // Usage (Mouse)

        0xA1, 0x01,                     // Collection (Application)

        // Report ID 1: Mouse buttons + scroll/pan
        0x85, 0x01,                     //     Report Id 1 
        0x09, 0x01,                     //     Usage (Pointer)
        0xA1, 0x00,                     //     Collection (Physical)
        0x95, 0x05,                     //         Report Count (3)
        0x75, 0x01,                     //         Report Size (1)
        0x05, 0x09,                     //         Usage Page (Buttons)
        0x19, 0x01,                     //             Usage Minimum (01)
        0x29, 0x05,                     //             Usage Maximum (05)
        0x15, 0x00,                     //             Logical Minimum (0)
        0x25, 0x01,                     //             Logical Maximum (1)
        0x81, 0x02,                     //             Input (Data, Variable, Absolute)
        0x95, 0x01,                     //             Report Count (1)
        0x75, 0x03,                     //             Report Size (3)
        0x81, 0x01,                     //             Input (Constant) for padding
        0x75, 0x08,                     //             Report Size (8)
        0x95, 0x01,                     //             Report Count (1)
        0x05, 0x01,                     //         Usage Page (Generic Desktop)
        0x09, 0x38,                     //             Usage (Wheel)
        0x15, 0x81,                     //             Logical Minimum (-127)
        0x25, 0x7F,                     //             Logical Maximum (127)
        0x81, 0x06,                     //             Input (Data, Variable, Relative) 
        0x05, 0x0C,                     //         Usage Page (Consumer)
        0x0A, 0x38, 0x02,               //             Usage (AC Pan) 
        0x95, 0x01,                     //             Report Count (1)
        0x81, 0x06,                     //             Input (Data,Value,Relative,Bit Field)
        0xC0,                           //     End Collection (Physical)

        // Report ID 2: Mouse motion
        0x85, 0x02,                     //     Report Id 2 
        0x09, 0x01,                     //     Usage (Pointer)
        0xA1, 0x00,                     //     Collection (Physical)
        0x75, 0x0C,                     //         Report Size (12)
        0x95, 0x02,                     //         Report Count (2)
        0x05, 0x01,                     //         Usage Page (Generic Desktop)
        0x09, 0x30,                     //             Usage (X)                                                  
        0x09, 0x31,                     //             Usage (Y)
        0x16, 0x01, 0xF8,               //             Logical maximum (2047) 
        0x26, 0xFF, 0x07,               //             Logical minimum (-2047) 
        0x81, 0x06,                     //             Input (Data, Variable, Relative) 
        0xC0,                           //     End Collection (Physical) 
        0xC0,                           // End Collection (Application)

        // Report ID 3: Advanced buttons
        0x05, 0x0C,                     // Usage Page (Consumer)
        0x09, 0x01,                     // Usage (Consumer Control) 
        0xA1, 0x01,                     // Collection (Application)
        0x85, 0x03,                     //     Report Id (3) 
        0x15, 0x00,                     //     Logical minimum (0)
        0x25, 0x01,                     //     Logical maximum (1) 
        0x75, 0x01,                     //     Report Size (1)
        0x95, 0x01,                     //     Report Count (1)

        0x09, 0xCD,                     //     Usage (Play/Pause) 
        0x81, 0x06,                     //     Input (Data,Value,Relative,Bit Field)
        0x0A, 0x83, 0x01,               //     Usage (AL Consumer Control Configuration) 
        0x81, 0x06,                     //     Input (Data,Value,Relative,Bit Field)
        0x09, 0xB5,                     //     Usage (Scan Next Track)
        0x81, 0x06,                     //     Input (Data,Value,Relative,Bit Field)   
        0x09, 0xB6,                     //     Usage (Scan Previous Track)
        0x81, 0x06,                     //     Input (Data,Value,Relative,Bit Field) 

        0x09, 0xEA,                     //     Usage (Volume Down)
        0x81, 0x06,                     //     Input (Data,Value,Relative,Bit Field) 
        0x09, 0xE9,                     //     Usage (Volume Up) 
        0x81, 0x06,                     //     Input (Data,Value,Relative,Bit Field) 
        0x0A, 0x25, 0x02,               //     Usage (AC Forward) 
        0x81, 0x06,                     //     Input (Data,Value,Relative,Bit Field) 
        0x0A, 0x24, 0x02,               //     Usage (AC Back) 
        0x81, 0x06,                     //     Input (Data,Value,Relative,Bit Field) 
        0xC0                            // End Collection
    };

    // Initialize HID Service
    p_input_report                      = &inp_rep_array[INPUT_REP_BUTTONS_INDEX];
    p_input_report->writable            = true;
    p_input_report->max_len             = INPUT_REP_BUTTONS_LEN;
    p_input_report->rep_ref.report_id   = INPUT_REP_REF_BUTTONS_ID;
    p_input_report->rep_ref.report_type = BLE_HIDS_REP_TYPE_INPUT;
    
    BLE_GAP_CONN_SEC_MODE_SET_ENC_NO_MITM(&p_input_report->attr_md.cccd_write_perm);
    BLE_GAP_CONN_SEC_MODE_SET_ENC_NO_MITM(&p_input_report->attr_md.read_perm);
    BLE_GAP_CONN_SEC_MODE_SET_ENC_NO_MITM(&p_input_report->attr_md.write_perm);

    p_input_report                      = &inp_rep_array[INPUT_REP_MOVEMENT_INDEX];
    p_input_report->writable            = true;
    p_input_report->max_len             = INPUT_REP_MOVEMENT_LEN;
    p_input_report->rep_ref.report_id   = INPUT_REP_REF_MOVEMENT_ID;
    p_input_report->rep_ref.report_type = BLE_HIDS_REP_TYPE_INPUT;
    
    BLE_GAP_CONN_SEC_MODE_SET_ENC_NO_MITM(&p_input_report->attr_md.cccd_write_perm);
    BLE_GAP_CONN_SEC_MODE_SET_ENC_NO_MITM(&p_input_report->attr_md.read_perm);
    BLE_GAP_CONN_SEC_MODE_SET_ENC_NO_MITM(&p_input_report->attr_md.write_perm);

    p_input_report                      = &inp_rep_array[INPUT_REP_MPLAYER_INDEX];
    p_input_report->writable            = true;
    p_input_report->max_len             = INPUT_REP_MEDIA_PLAYER_LEN;
    p_input_report->rep_ref.report_id   = INPUT_REP_REF_MPLAYER_ID;
    p_input_report->rep_ref.report_type = BLE_HIDS_REP_TYPE_INPUT;
    
    BLE_GAP_CONN_SEC_MODE_SET_ENC_NO_MITM(&p_input_report->attr_md.cccd_write_perm);
    BLE_GAP_CONN_SEC_MODE_SET_ENC_NO_MITM(&p_input_report->attr_md.read_perm);
    BLE_GAP_CONN_SEC_MODE_SET_ENC_NO_MITM(&p_input_report->attr_md.write_perm);

    hid_info_flags = HID_INFO_FLAG_REMOTE_WAKE_MSK | HID_INFO_FLAG_NORMALLY_CONNECTABLE_MSK;
    
    memset(&hids_init_obj, 0, sizeof(hids_init_obj));

    hids_init_obj.evt_handler                    = on_hids_evt;
    hids_init_obj.error_handler                  = service_error_handler;
    hids_init_obj.is_kb                          = false;
    hids_init_obj.is_mouse                       = true;
    hids_init_obj.inp_rep_count                  = INPUT_REPORT_COUNT;
    hids_init_obj.p_inp_rep_array                = inp_rep_array;
    hids_init_obj.outp_rep_count                 = 0;
    hids_init_obj.p_outp_rep_array               = NULL;
    hids_init_obj.feature_rep_count              = 0;
    hids_init_obj.p_feature_rep_array            = NULL;
    hids_init_obj.rep_map.data_len               = sizeof(rep_map_data);
    hids_init_obj.rep_map.p_data                 = rep_map_data;
    hids_init_obj.is_boot_kb_inp_rep_writable    = false;
    hids_init_obj.is_boot_mouse_inp_rep_writable = true;
    hids_init_obj.hid_information.bcd_hid        = BASE_USB_HID_SPEC_VERSION;
    hids_init_obj.hid_information.b_country_code = 0;
    hids_init_obj.hid_information.flags          = hid_info_flags;
    hids_init_obj.included_services_count        = 0;
    hids_init_obj.p_included_services_array      = NULL;
    
    BLE_GAP_CONN_SEC_MODE_SET_ENC_NO_MITM(&hids_init_obj.rep_map.rep_map_attr_md.read_perm);
    BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&hids_init_obj.rep_map.rep_map_attr_md.write_perm);
    BLE_GAP_CONN_SEC_MODE_SET_ENC_NO_MITM(&hids_init_obj.hid_information.char_attr_md.read_perm);
    BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&hids_init_obj.hid_information.char_attr_md.write_perm);

    BLE_GAP_CONN_SEC_MODE_SET_ENC_NO_MITM(&hids_init_obj.hids_boot_mouse_inp_rep.cccd_write_perm);
    BLE_GAP_CONN_SEC_MODE_SET_ENC_NO_MITM(&hids_init_obj.hids_boot_mouse_inp_rep.read_perm);
    BLE_GAP_CONN_SEC_MODE_SET_ENC_NO_MITM(&hids_init_obj.hids_boot_mouse_inp_rep.write_perm);

    BLE_GAP_CONN_SEC_MODE_SET_ENC_NO_MITM(&hids_init_obj.hids_protocol_mode_attr_md.read_perm);
    BLE_GAP_CONN_SEC_MODE_SET_ENC_NO_MITM(&hids_init_obj.hids_protocol_mode_attr_md.write_perm);
    BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&hids_init_obj.hids_ctrl_point.read_perm);
    BLE_GAP_CONN_SEC_MODE_SET_ENC_NO_MITM(&hids_init_obj.hids_ctrl_point.write_perm);

    err_code = ble_hids_init(&s_hids, &hids_init_obj);
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }
}


/**@brief Initialize services that will be used by the application.
 */
static void services_init(void)
{
    dis_init();
    bas_init();
    hids_init();
}


/**@brief Initialize the battery sensor simulator.
 */
static void sensor_sim_init(void)
{
    s_battery_sim_cfg.min          = MIN_BATTERY_LEVEL;
    s_battery_sim_cfg.max          = MAX_BATTERY_LEVEL;
    s_battery_sim_cfg.incr         = BATTERY_LEVEL_INCREMENT;
    s_battery_sim_cfg.start_at_max = true;
    
    ble_sensorsim_init(&s_battery_sim_state, &s_battery_sim_cfg);
}


/**@brief Initialize security parameters.
 */
static void sec_params_init(void)
{
    s_sec_params.timeout      = SEC_PARAM_TIMEOUT;
    s_sec_params.bond         = SEC_PARAM_BOND;
    s_sec_params.mitm         = SEC_PARAM_MITM;
    s_sec_params.io_caps      = SEC_PARAM_IO_CAPABILITIES;
    s_sec_params.oob          = SEC_PARAM_OOB;  
    s_sec_params.min_key_size = SEC_PARAM_MIN_KEY_SIZE;
    s_sec_params.max_key_size = SEC_PARAM_MAX_KEY_SIZE;
}


/**@brief Connection Parameters module error handler.
 *
 * @param[in]   nrf_error   Error code containing information about what went wrong.
 */
static void conn_params_error_handler(uint32_t nrf_error)
{
    ASSERT(false);
}


/**@brief Initialize the Connection Parameters module.
 */
static void conn_params_init(void)
{
    uint32_t               err_code;
    ble_conn_params_init_t cp_init;
    ble_hids_rep_char_t    mouse_input_rep_char = s_hids.inp_rep_array[INPUT_REP_MOVEMENT_INDEX];
    
    memset(&cp_init, 0, sizeof(cp_init));

    cp_init.p_conn_params                  = NULL;
    cp_init.first_conn_params_update_delay = FIRST_CONN_PARAM_UPDATE_DELAY;
    cp_init.next_conn_params_update_delay  = NEXT_CONN_PARAM_UPDATE_DELAY;
    cp_init.max_conn_params_update_count   = MAX_CONN_PARAM_UPDATE_COUNT;
    cp_init.start_on_notify_cccd_handle    = mouse_input_rep_char.char_handles.cccd_handle;
    cp_init.disconnect_on_fail             = false;
    cp_init.evt_handler                    = NULL;
    cp_init.error_handler                  = conn_params_error_handler;
    
    err_code = ble_conn_params_init(&cp_init);
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }
}


/**@brief Start timers.
 */
static void timers_start(void)
{
    uint32_t err_code;
    
    err_code = app_timer_start(APP_TIMER_BATTERY_LEVEL_MEAS, 
                               battery_level_meas_timeout_handler, 
                               BATTERY_LEVEL_MEAS_INTERVAL, 
                               APP_TIMER_MODE_REPEATED, 
                               APP_SCHED_QUEUE_LOW_PRI);
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }
}


/**@brief Start advertising.
 */
static void advertising_start(void)
{
    uint32_t             err_code;
    ble_gap_adv_params_t adv_params;
    
    // Start advertising
    memset(&adv_params, 0, sizeof(adv_params));
    
    adv_params.type        = BLE_GAP_ADV_TYPE_ADV_IND;
    adv_params.p_peer_addr = NULL;
    adv_params.fp          = BLE_GAP_ADV_FP_ANY;
    adv_params.interval    = APP_ADV_INTERVAL;
    adv_params.timeout     = APP_ADV_TIMEOUT_IN_SECONDS;

    err_code = ble_gap_adv_start(&adv_params);
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }
    
    nrf_gpio_pin_set(ADVERTISING_LED_PIN_NO);
}


/**@brief HID event handler.
 *
 * @details This function will be called for all HID events which are passed to the application.
 *
 * @param[in]   p_hids  HID service stucture.
 * @param[in]   p_evt   Event received from the HID service.
 */
static void on_hids_evt(ble_hids_t * p_hids, ble_hids_evt_t *p_evt)
{
    switch (p_evt->evt_type)
    {
        case BLE_HIDS_EVT_BOOT_MODE_ENTERED:
            s_in_boot_mode = true;
            break;

        case BLE_HIDS_EVT_REPORT_MODE_ENTERED:
            s_in_boot_mode = false;
            break;
            
        default:
            break;
    }
}


/**@brief Application's BLE Stack event handler.
 *
 * @param[in]   p_ble_evt   Bluetooth stack event.
 */
static void on_ble_evt(ble_evt_t * p_ble_evt)
{
    uint32_t                         err_code = NRF_SUCCESS;
    static uint16_t                  s_conn_handle = BLE_CONN_HANDLE_INVALID;
    static ble_gap_evt_auth_status_t s_auth_status;
    ble_gap_enc_info_t *             p_enc_info;
    
    switch (p_ble_evt->header.evt_id)
    {
        case BLE_GAP_EVT_CONNECTED:
            nrf_gpio_pin_set(CONNECTED_LED_PIN_NO);
            nrf_gpio_pin_clear(ADVERTISING_LED_PIN_NO);
            s_conn_handle = p_ble_evt->evt.gatts_evt.conn_handle;
            break;
            
        case BLE_GAP_EVT_DISCONNECTED:
            nrf_gpio_pin_clear(CONNECTED_LED_PIN_NO);
            s_conn_handle = BLE_CONN_HANDLE_INVALID;
            advertising_start();
            break;
            
        case BLE_GAP_EVT_SEC_PARAMS_REQUEST:
            err_code = ble_gap_sec_params_reply(s_conn_handle, 
                                                BLE_GAP_SEC_STATUS_SUCCESS, 
                                                &s_sec_params);
            break;

        case BLE_GATTS_EVT_SYS_ATTR_MISSING:
            err_code = ble_gatts_sys_attr_set(s_conn_handle, NULL, 0);
            break;

        case BLE_GAP_EVT_AUTH_STATUS:
            s_auth_status = p_ble_evt->evt.gap_evt.params.auth_status;
            break;
            
        case BLE_GAP_EVT_SEC_INFO_REQUEST:
            p_enc_info = &s_auth_status.periph_keys.enc_info;
            if (p_enc_info->div == p_ble_evt->evt.gap_evt.params.sec_info_request.div)
            {
                err_code = ble_gap_sec_info_reply(s_conn_handle, p_enc_info, NULL);
            }
            else
            {
                // No keys found for this device
                err_code = ble_gap_sec_info_reply(s_conn_handle, NULL, NULL);
            }
            break;

        case BLE_GAP_EVT_TIMEOUT:
            if (p_ble_evt->evt.gap_evt.params.timeout.src == BLE_GAP_TIMEOUT_TYPE_ADVERTISEMENT)
            { 
                nrf_gpio_pin_clear(ADVERTISING_LED_PIN_NO);

                // Go to system-off mode (this function will not return; wakeup will cause a reset)
                err_code = nrf_power_system_off();    
            }
            break;

        default:
            break;
    }

    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }
}


/**@brief Dispatches a BLE stack event to all modules with a BLE stack event handler.
 *
 * @details This function is called from the scheduler in the main loop after a BLE stack
 *          event has been received.
 *
 * @param[in]   p_ev_data   Scheduler event containing a bluetooth event.
 */
static void ble_evt_dispatch(app_sched_event_data_t * p_ev_data)
{
    ble_evt_t * p_ble_evt;
    
    ASSERT(p_ev_data->event_id == APP_SCHED_EVENT_BLE);
    
    p_ble_evt = &p_ev_data->data.ble.ble_evt;

    on_ble_evt(p_ble_evt);
    ble_conn_params_on_ble_evt(p_ble_evt);
    ble_hids_on_ble_evt(&s_hids, p_ble_evt);
    ble_bas_on_ble_evt(&s_bas, p_ble_evt);
}


/**@brief Pass bluetooth stack event to scheduler.
 *
 * @details This function is called from the BLE Stack event interrupt handler after a BLE stack
 *          event has been received.
 *
 * @param[in]   p_ble_evt   Bluetooth stack event.
 */
static void ble_evt_schedule(ble_evt_t * p_ble_evt)
{
    uint32_t               err_code;
    app_sched_event_data_t ev_data;
    
    ev_data.event_id         = APP_SCHED_EVENT_BLE;
    ev_data.data.ble.ble_evt = *p_ble_evt;
    
    err_code = app_sched_event_put(&ev_data, ble_evt_dispatch, APP_SCHED_QUEUE_LOW_PRI);
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }
}


/**@brief BLE stack initialization.
 *
 * @details Initializes the SoftDevice and the BLE event interrupt.
 */
static void ble_stack_init(void)
{
    uint32_t err_code = ble_stack_handler_init(NRF_CLOCK_LFCLKSRC_XTAL_20_PPM, ble_evt_schedule);
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }
}


/**@brief Function to send Mouse Movement.
 *
 * @param[in]   x_delta   Horizontal movement.
 * @param[in]   y_delta   Vertical movement.
 */
static void mouse_movement_send(int16_t x_delta, int16_t y_delta)
{
    uint32_t err_code;
    
    if (s_in_boot_mode)
    {
        x_delta = MIN(x_delta, 0x00ff);
        y_delta = MIN(y_delta, 0x00ff);
        
        err_code = ble_hids_boot_mouse_inp_rep_send(&s_hids,
                                                    0x00, 
                                                    (int8_t)x_delta, 
                                                    (int8_t)y_delta,
                                                    0,
                                                    NULL);
    }
    else
    {
        uint8_t buffer[INPUT_REP_MOVEMENT_LEN];
        
        ASSERT(INPUT_REP_MOVEMENT_LEN == 3);
        
        x_delta = MIN(x_delta, 0x0fff);
        y_delta = MIN(y_delta, 0x0fff);

        buffer[0] = x_delta & 0x00ff;
        buffer[1] = ((y_delta & 0x000f) << 4) | ((x_delta & 0x0f00) >> 8);
        buffer[2] = (y_delta & 0x0ff0) >> 4;
        
        err_code = ble_hids_inp_rep_send(&s_hids,
                                         INPUT_REP_MOVEMENT_INDEX, 
                                         INPUT_REP_MOVEMENT_LEN, 
                                         buffer);
    }
    
    if (
        (err_code != NRF_SUCCESS)
        &&
        (err_code != NRF_ERROR_INVALID_STATE)
        &&
        (err_code != BLE_ERROR_NO_TX_BUFFERS)
        &&
        (err_code != BLE_ERROR_GATTS_SYS_ATTR_MISSING)
    )
    {
        ASSERT(false);
    }
}


/**@brief Mouse event handler.
 *
 * @details This function is called from the scheduler in the main loop after a mouse
 *          event has been received.
 *
 * @param[in]   p_ev_data   Scheduler event containing a mouse event.
 */
static void mouse_event_handler(app_sched_event_data_t *p_ev_data)
{
    ASSERT(p_ev_data->event_id == APP_SCHED_EVENT_MOUSE);
    mouse_movement_send(p_ev_data->data.mouse.x_delta, p_ev_data->data.mouse.y_delta);
}


/**@brief Passes a mouse event to the Scheduler.
 *
 * @details Will be called from the GPIOTE interrupt handler when a push button event has been 
 *          detected.
 *
 * @param[in]   x_delta   Horizontal movement.
 * @param[in]   y_delta   Vertical movement.
 */
static void mouse_event_schedule(int16_t x_delta, int16_t y_delta)
{
    uint32_t               err_code;
    app_sched_event_data_t ev_data;
    
    ev_data.event_id           = APP_SCHED_EVENT_MOUSE;
    ev_data.data.mouse.x_delta = x_delta;
    ev_data.data.mouse.y_delta = y_delta;
    
    err_code = app_sched_event_put(&ev_data, mouse_event_handler, APP_SCHED_QUEUE_LOW_PRI);
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }
}


/**@brief GPIOTE interrupt handler.
 */
void GPIOTE_IRQHandler(void)
{
    if (
        (NRF_GPIOTE->EVENTS_PORT != 0) 
        && 
        ((NRF_GPIOTE->INTENSET & GPIOTE_INTENSET_PORT_Msk) != 0)
    )
    {
        NRF_GPIOTE->EVENTS_PORT = 0;
        
        if (nrf_gpio_pin_read(LEFT_BUTTON_PIN_NO) == 0)         // Left button
        {
            mouse_event_schedule(-MOVEMENT_SPEED, 0);
        } 
        else if (nrf_gpio_pin_read(RIGHT_BUTTON_PIN_NO) == 0)   // Right button
        {
            mouse_event_schedule(MOVEMENT_SPEED, 0);
        } 
        else if (nrf_gpio_pin_read(UP_BUTTON_PIN_NO) == 0)      // Up button
        {
            mouse_event_schedule(0, -MOVEMENT_SPEED);
        } 
        else if (nrf_gpio_pin_read(DOWN_BUTTON_PIN_NO) == 0)    // Down button
        {
            mouse_event_schedule(0, MOVEMENT_SPEED);
        } 
    }
}


/**@brief Initialize GPIOTE module for detecting buttons.
 */
static void buttons_init(void)
{
    uint32_t err_code;
    uint32_t per_rdy;
    
    // Power on GPIOTE module
    err_code = nrf_power_perpower_set(POWER_PERPOWER_GPIOTE_Msk);
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }

    do
    {
        err_code = nrf_power_perrdy_get(&per_rdy);
        if (err_code != NRF_SUCCESS)
        {
            ASSERT(false);
        }
    } while ((per_rdy & POWER_PERRDY_GPIOTE_Msk) == 0);
    
    // Initialize GPIOTE module
    NRF_GPIOTE->INTENCLR = 0xffffffffUL;
    NRF_GPIOTE->INTENSET = GPIOTE_INTENSET_PORT_Msk;

    // Configure the buttons. All buttons shall be wakeup pins.
    NRF_GPIO->PIN_CNF[LEFT_BUTTON_PIN_NO] =
                                          (GPIO_PIN_CNF_DIR_Input     << GPIO_PIN_CNF_DIR_Pos)    |
                                          (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)  |
                                          (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos)   |
                                          (GPIO_PIN_CNF_DRIVE_S0S1    << GPIO_PIN_CNF_DRIVE_Pos)  |
                                          (GPIO_PIN_CNF_SENSE_Low     << GPIO_PIN_CNF_SENSE_Pos);
                                          
    NRF_GPIO->PIN_CNF[RIGHT_BUTTON_PIN_NO] =
                                          (GPIO_PIN_CNF_DIR_Input     << GPIO_PIN_CNF_DIR_Pos)    |
                                          (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)  |
                                          (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos)   |
                                          (GPIO_PIN_CNF_DRIVE_S0S1    << GPIO_PIN_CNF_DRIVE_Pos)  |
                                          (GPIO_PIN_CNF_SENSE_Low     << GPIO_PIN_CNF_SENSE_Pos);
                                          
    NRF_GPIO->PIN_CNF[UP_BUTTON_PIN_NO] =
                                          (GPIO_PIN_CNF_DIR_Input     << GPIO_PIN_CNF_DIR_Pos)    |
                                          (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)  |
                                          (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos)   |
                                          (GPIO_PIN_CNF_DRIVE_S0S1    << GPIO_PIN_CNF_DRIVE_Pos)  |
                                          (GPIO_PIN_CNF_SENSE_Low     << GPIO_PIN_CNF_SENSE_Pos);
                                          
    NRF_GPIO->PIN_CNF[DOWN_BUTTON_PIN_NO] =
                                          (GPIO_PIN_CNF_DIR_Input     << GPIO_PIN_CNF_DIR_Pos)    |
                                          (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)  |
                                          (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos)   |
                                          (GPIO_PIN_CNF_DRIVE_S0S1    << GPIO_PIN_CNF_DRIVE_Pos)  |
                                          (GPIO_PIN_CNF_SENSE_Low     << GPIO_PIN_CNF_SENSE_Pos);                                          
                                          
    err_code = nrf_nvic_ClearPendingIRQ(GPIOTE_IRQn);
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }
    
    err_code = nrf_nvic_SetPriority(GPIOTE_IRQn, NRF_APP_PRIORITY_LOW);
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }
    
    err_code = nrf_nvic_EnableIRQ(GPIOTE_IRQn);
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }
}


/**@brief Power manager.
 */
static void power_manage(void)
{
    uint32_t err_code = nrf_wait_for_app_event();
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }
}


/**@brief Application main function.
 */
int main(void)
{
    // Initialize
    leds_init();
    ble_stack_init();
    app_sched_init();
    timers_init();
    buttons_init();
    gap_params_init();
    advertising_init();
    services_init();
    sensor_sim_init();
    conn_params_init();
    sec_params_init();
    
    // Start execution
    timers_start();
    advertising_start();
    
    // Enter main loop
    for (;;)
    {
        app_sched_schedule();
        power_manage();
    }
}

/** 
 * @}
 */
